Circular No. 8343
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT@CFA.HARVARD.EDU (science)
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COMET C/2004 K1 (CATALINA)
     An apparently asteroidal object reported by the Catalina Sky
Survey (discovery observation given below), and posted on the NEO
Confirmation Page, has been found by T. Spahr to show a weak coma
with a possible very faint extension to the west on CCD images
obtained by J. B. Battat and himself (Mt. Hopkins 1.2-m reflector)
on May 24.4 UT; the FWHM of the comet image is 20 percent larger
than other stars of similar brightness in the field.  R. Stoss
reports that CCD images taken by S. Sanchez, J. Nomen, and himself
on May 24.1 (0.30-m reflector, Mallorca) shows the object to have a
softer image than surrounding field stars.

     2004 UT             R.A. (2000) Decl.       Mag.
     May  21.40758   20 43 06.88   - 4 17 23.0   18.6

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2004-K50.

     T = 2005 July  4.680 TT          Peri. =  97.280
                                      Node  = 326.888   2000.0
     q = 3.41992 AU                   Incl. = 153.701


SUPERNOVA 2004bu IN UGC 10089
     Further to IAUC 8341, T. Boles reports his discovery, on
unfiltered CCD images taken on May 18.981 and 19.896 UT, of an
apparent supernova (mag 17.1) located at R.A. = 15h54m52s.03, Decl.
= +21o07'11".0 (equinox 2000.0), which is approximately 1".2 west
and 10".5 north of the center of UGC 10089.  SN 2004bu is not
present on Boles' images from Mar. 20 and Jan. 29 (limiting mag
19.5) or on Digitized Sky Survey red (1992) or blue (1993) plates.


SUPERNOVA 2004br IN NGC 4493
     C. L. Gerardy, University of Texas at Austin, reports that a
low-resolution optical spectrogram (resolution 300; range 500-1000
nm) of SN 2004br (cf. IAUC 8340), obtained on May 18.20 UT with the
9.2-m Hobby/Eberly Telescope by B. Roman and F. Deglman, shows it
to be an unusual type-Ia supernova, similar to the spectrum of SN
2000cx at three days before maximum light (Li et al. 2001, PASP
113, 1178).  Adopting the NED redshift of NGC 4493 (6949 km/s), the
expansion velocity of the (rather weak) Si II feature (rest
wavelength 635.5 nm) is 9500 km/s.

                      (C) Copyright 2004 CBAT
2004 May 24                    (8343)            Daniel W. E.